Features： 1、Aluminium Alloy: The flower drum ring gear is made of aluminium alloy materials, which is not easy to rust, durable, strong, and suitable for long term use. 2、Scope of Applications: This bike 12 Speed MS freehub body has good compatibility, suitable for M6100 M7100 M8100 M9100. 3、High Stiffness: The thickened material makes this bike tool have good compression resistance, waterproof. Not worried about outdoor use. 4、Easy and Quick Disassembly: Easy and quick disassembly of the bike freehub body, it is a great accessory for mountain bikes and road bikes. 5、Lightweight and Portable: This mountain bike cassette body is lightweight and compact, easy to carry for a practical repairing tool for outdoor riding. Specification： Item Type: Bike Flower Drum Tower Base Material: Aluminium alloy Gross Weight: 77g / 2.7oz Product Style: MS Product Application: for M6100 M7100 M8100 M9100. Package List： 1 x Bike Freehub Body